Some animals only have ___ cell.

The pH of a solution with a hydroxide ion concentration of 2.3 x 10^-5 M is approximately 9.362.

pOH = -log[OH-]

Since pH + pOH = 14 (at 25°C), we can rearrange the equation to solve for pH:

pH = 14 - pOH

Given that the concentration of OH- is 2.3 x 10^-5 M, we can calculate the pOH as follows:

pOH = -log(2.3 x 10^-5)

Using logarithm properties, we can simplify the expression:

pOH = -log(2.3) - log(10^-5)

Since log(10^-5) = -5, the equation becomes:

pOH = -log(2.3) - (-5)

Next, we need to calculate the value of -log(2.3):

log(2.3) ≈ -0.362

Substituting this value into the pOH equation:

pOH ≈ -0.362 - (-5)

pOH ≈ -0.362 + 5

pOH ≈ 4.638

Now, we can calculate the pH using the pH + pOH = 14 equation:

pH = 14 - 4.638

pH ≈ 9.362

Therefore, the pH of a solution with a hydroxide ion concentration of 2.3 x 10^-5 M is approximately 9.362.  It's possible that the concentration was meant to be 2.3 x 10-9 M, which would give a pH of 9.64. Alternatively, if the concentration of H+ ions was given instead, we could use the formula pH = -log[H+] to find the pH of the solution.

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It is false that when two water molecules are near each other, a hydrogen bond will form between the more positive and the more negative atoms.

A water particle is composed of two hydrogen atoms and one oxygen atom.

When there are two water particles close a bond is formed between the hydrogen atom of one particle and the oxygen atom of a neighbor water particle, which means there is a hydrogen-oxygen bond rather than a hydrogen-hydrogen bond.

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It is True that when two water molecules are near each other, a hydrogen bond will form between the more positive hydrogen atom of one molecule and the more negative oxygen atom of the neighboring molecule.

A water molecule is made up of two hydrogen atoms bonded to an oxygen atom, and its overall structure is bent. This is because the oxygen atom, forms a bond with hydrogen atoms. It also carries two pairs of unshared electrons. All of the electron pairs (shared and unshared) repel each other.

Hydrogen bond will form between the more positive and the more negative atoms of neighboring water molecules when two water molecules are near each other. This is due to the polar nature of water molecules, which have a slightly positive charge on the hydrogen atoms and a slightly negative charge on the oxygen atoms. These hydrogen bonds give water many of its unique properties, such as its high surface tension and high heat of vaporization.

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The mass of the asteroid is C. 1.2 x \(10^{12}\) Kg

To find the mass of the other asteroid, we can rearrange the equation for the gravitational force between two objects:

F = (G * m1 * m2) / \(r^{2}\)

where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two asteroids, and r is the distance between them.

Given that the distance between the asteroids is 75000 m, the force of gravity between them is 1.14 N, and one asteroid has a mass of 8 x \(10^{7}\) kg, we can substitute these values into the equation and solve for the mass of the other asteroid (m2):

1.14 N = (6.67430 × \(10^{-11}\) N \(m^{2}\)/\(Kg^{2}\) * 8 x \(10^{7}\) kg * \(m2\)) / \((75000 m)^{2}\)

Simplifying and solving the equation, we find that the mass of the other asteroid (m2) is approximately 1.2 x \(10^{12}\) kg. Therefore, Option C is correct.

The question was incomplete. find the full content below:

Two asteroids are 75000 m apart one has a mass of 8 x \(10^{7}\) kg if the force of gravity between them is 1.14 what is the mass of the asteroid

A. 3.4 x \(10^{11}\) kg

B. 8.3 x \(10^{12}\) kg

C. 1.2 x \(10^{12}\) kg

D. 1.2 x \(10^{10}\) kg

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Answer:

55.0125 grams NO2

Explanation:

So we have 80 grams of O2, first convert to moles

80 g O2 * 1 mol/32 g O2 = 2.5 mol O2

Next use the mole ratio of O2 to NO2

2.5 mol O2* 1 mol NO2/2 mol NO2=1.25 mol NO2

Since the question is asking how many grams, convert NO2 to grams

1.25 mol NO2 * 44.01 NO2/1 mol NO2= 55.0125 grams

The concentration of iron used in the titration : 0.009 M

Given

Reaction

Cr₂O₇²⁻ + 6Fe²⁺ + 14H⁺ ⇒ 2Cr³⁺ + 6Fe³⁺ + 7H₂O

0.0093 mol/L potassium  dichromate

200 cm³ of dilute acid, 25cm³   was used in the titration.

Required

the concentration of iron

Solution

Titration formula

C₁V₁n₁=C₂V₂n₂⇒ From equation : n₁=6n₂(1=Cr₂O₇, 2=Fe)

titration average : 33+32.05+32.15+32.1 / 4 = 32.325 cm³(ml)

25 cm³ of iron solution used in titration :

\(\tt V_1=32.325~ml\\\\V_2=25~ml\\\\C_1=0.0093~M\\\\\\\\C_1.V_1.n_2=C_2.V_2.n_1\\\\0.0093\times 32.325\times 6=C_2\times 25\times 1\\\\C_2=0.07215~M\)

Dilution(25 ml from 200 ml iron solution)

\(\tt C_2.V_2=C_1.V_1\\\\0.007215\times 25=C_1\times 200\\\\C_1=0.009~M\)

Answer:

This is because no energy is being created or destroyed in this system

Explanation:

I think this is correct? I hope it helps.        

The volume of the gas at STP would be 23.93 liters.

The volume of gas at STP (Standard Temperature and Pressure), we need to use the Ideal Gas Law, which states that PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the gas constant, and T is temperature. First, we need to calculate the number of moles of gas in the initial sample. We can use the formula n = PV/RT, where P is the initial pressure, V is the initial volume, R is the gas constant, and T is the initial temperature.
n = (2.31 atm) x (25.15 L) / [(0.0821 L atm/mol K) x (201 + 273.15 K)]
n = 1.067 moles

Now, we can use the molar volume of gas at STP, which is 22.4 L/mol, to calculate the volume of gas at STP.
V = n x 22.4 L/mol
V = 1.067 moles x 22.4 L/mol
V = 23.93 L
Therefore, the volume of the gas at STP would be 23.93 liters.

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Answer:

covalent bond

Explanation:

a covalent bond forms when electrons are shared between two nonmetals

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The volume of the gold plates in cm₃ is 2.513274 cm₃

Volume is the space occupied by a three-dimensional object“”

Volume = {mass} {density}

Given that the thickness or height of medallion, h = 2 mm = 0.2 cm

Diameter of the medallion, d = 4 cm

Radius of medallion, r = d/2 = 2 cm⁻³

The thickness of the gold plating, x = 1 μm = 10⁻⁴ cm

The density of gold = 19.3 g cm

Now we know that the shape of a medallion is cylindrical.

Hence, the volume of the medallion before platting,

Vbefore = π.r2.h = π.(2)2.0.2 = 2.513274 cm₃

Therefore, the volume of the gold-plated is 2.513274 cm₃.

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Answer:

The law of constant composition states that the proportions of the elements in a compound are always the same, no matter how the compound is made.

The covalent bond is present in the compound C₃H₈. The reactant C is 3, product C is 6, reactant H is 8, product H is 10, Reactant O is 2, product O is 9.

What is covalent bond ?

Atoms share electron pair between them in covalent bonds. H-H or C-H are examples of nonpolar covalent bonds between atoms with similar or identical electronegativity, whereas polar covalent bonds are formed when unequal electronegativity is shared between atoms (e.g., H–O).

What is reactant ?

Raw materials known as reactants combine to create products. When the right factors, such as temperature, time, or pressure, come into play, the chemical bonds between the reactants are broken, allowing the atoms to form new bonds that lead to various combinations.

Therefore, covalent bond is present in the compound C₃H₈. The reactant C is 3, product C is 6, reactant H is 8, product H is 10, Reactant O is 2, product O is 9.

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Water molecules attract the ions from the solute and then collapse the crystal the attraction occurs between the water molecules and the ions in the crystal such that they are pulled apart and the crystal dissolve.

Water dissolves substances by breaking apart their molecular bonds and surrounding the individual molecules. This process is called solvation, and it occurs when the attractive forces between the solvent (in this case, water) and the solute (the substance being dissolved) are stronger than the forces holding the solute molecules together.

The polar nature of water molecules allows them to form hydrogen bonds with other polar or ionic substances, causing the solute molecules to become surrounded by water molecules and become dispersed throughout the solvent. This creates a hom---ogeneous mixture known as a solution.

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Answer:

Bond cleavage, or bond fission, is the splitting of chemical bonds. This can be generally referred to as dissociation when a molecule is cleaved into two or more fragments. In general, there are two classifications for bond cleavage: homolytic and heterolytic, depending on the nature of the process. ... The singlet excitation energy of a silicon–silicon sigma bond is lower than.

The question is incomplete, the complete question is;

The rate of reaction was measured during a chemical reaction. After the first 3 seconds, the rate of reaction was 1.8 x10−6 M/s. Which of the following would you expect after another 3 seconds? a

The rate would be higher, and the concentration of reactants would be lower.

b

The rate would be higher, and the concentration of reactants would be higher.

c

The rate would be lower, and the concentration of reactants would be lower.

d

The rate would be lower, and the concentration of reactants would be higher.

Answer:

The rate would be lower, and the concentration of reactants would be lower.

Explanation:

The rate of reaction refers to how quickly or slowly the reactants disappear or the products appear in a given reaction. The rate of reaction depends on the concentration of the reactants. Thus, as concentration decreases with time, the rate of reaction decreases accordingly.

Therefore, reaction rates tend to decrease with time since the concentration of  the reactants decrease with time as the reactants are being converted into products. Thus after three seconds, the rate would be lower, and the concentration of reactants would be lower. Hence the answer above.

Answer:

The rate would be lower, and the concentration of reactants would be higher.

Explanation:

I took the test and i think i got it right

The empirical formula of the compound with 14.3% Nitrogen, 4.1% Hydrogen, and 81.6% Bromine would be \(NH_4Br\).

The compound contains 3 atoms of different elements according to the following percentage:

Let's find the mole equivalent of each percentage:

Divide by the smallest mole:

Thus, the empirical formula of the compound is \(NH_4Br\).

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Answer:

A mole is the amount (10) of material containing 6.02214 × 10 raised to the power of 23 particles.

Answer:

Lake pontchartrain

Explanation:

Answer:

1. is Molar (with capital M)

2. is molal (m)

Explanation:

By definition, 1 Molar solutions have 1 mol of solute in 1 L of solution and 1 molal solutions have 1 mol of solute in 1 Kg of solvent

Answer:

Redox reaction

Explanation:

Answer:

Helium

Explanation:

The element that does not have the same number of electrons in its outermost shell as the other elements in its group is helium. The correct option is C.

Helium is a gas and the second element of the periodic table. It has an atomic number of 2. It is a colorless, odorless, and non-toxic gas. Furthermore, it is the lightest gas, and it is used in filling in the tires of airplanes and balloons.

The group in which helium is present in group 18. It contains 6 elements. Helium is the first element. All element in the periodic table has eight electrons in their last shell. But only helium has 2 electrons in its outer valence. So, helium is different from other elements present in its group.

Thus, the correct option is C. helium (He).

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Answer:

6.4×10¯³ g of O₂.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

CH₄ + 2O₂ —> CO₂ + 2H₂O

Next, we shall determine the masses of CH₄ and O₂ that reacted from the balanced equation. This can be obtained as follow:

Molar mass of CH₄ = 12 + (4×1)

= 12 + 4

= 16 g/mol

Mass of CH₄ from the balanced equation = 1 × 16 = 16 g

Molar mass of O₂ = 2 × 16 = 32 g/mol

Mass of O₂ from the balanced equation = 2 × 32 = 64 g

SUMMARY:

From the balanced equation above,

16 g of CH₄ reacted with 64 g of O₂.

Finally, we shall determine the mass of O₂ needed to react with 1.6×10¯³ g of CH₄. This can be obtained as illustrated below:

From the balanced equation above,

16 g of CH₄ reacted with 64 g of O₂.

Therefore, 1.6×10¯³ g of CH₄ will react with = (1.6×10¯³ × 64) / 16 = 6.4×10¯³ g of O₂

Thus, 6.4×10¯³ g of O₂ is needed for the reaction.

he correct answer is (C) M and S, which are the ions that remain in solution after the reaction has gone to completion.

When 20.0 mL of a 1.0 M solution of M2R3 and 50.0 mL of a 1.0 M solution of TS2 are mixed, a reaction occurs, producing two precipitates, MS3 and TR. The precipitates are solid compounds that are no longer in solution, so they are not included in the ions that remain in solution.

Based on the balanced chemical equation, the reactants in solution are M2R3 and TS2, which means that the ions that remain in solution are M and S (option C). The reaction consumes the R and T ions, causing them to combine with the M and S ions to form the solid precipitates.

Therefore, the correct answer is (C) M and S, which are the ions that remain in solution after the reaction has gone to completion.

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The atomic radius of the gold based on this structure in picometers ia given as:  21.7506

The atomic radius is: The average or normal distance from the nucleus's center to the edge of the surrounding electron shells is what we mean when we talk about an element's atomic radius.

We have the effective number of gold atoms to be 4 in a given unit cell

Then the molar mass of gold is given as 197 g / mol

The relationship between the edge length and the atomic radius is defined mathematically as:

√2a = 4r

make r the subject of the formula

r = √2a / 4

From the question the value of a is given as unit cell edge length of 61.52 pm

We would put this in the formula such that we would have:

r = √2 * 61.52 /4

r = 87.0024 /4

r = 21.7506

The atomic radius is  21.7506

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Answer:

Q = ΔH fusion * mass (g)

when we have:

ΔH fusion (the heat (or enthalpy) of fusion = 0.334 kJ/g

and mass of ice = 22.4 g  

so by substitution, we can get the energy (Q) required to melt this mass of ice:

∴ Q = 0.334KJ/g * 22.4 g  

      = 7.48 KJ

∴ the energy required to melt 22.4 g of ice is = 7.48 KJ

Explanation:

Charles's law of gases states that the density of an ideal gas is inversely proportional to its temperature at constant pressure.

The equation is as follows;

Va/Ta = Vb/Tb

Where;

0.67/362 = 1.12/Tb

0.00185Tb = 1.12

Tb = 605.41K

This temperature in °C is 605.41 - 273 = 332°C

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Answer:

The percentage relative abundance of Cu-63 is 69.5% and that of Cu-65 is 30.5%

Explanation:

The mass of Cu-63 is 62.9396 amu

The mass of Cu-65 is 64.9278 amu

Relative abundance of each isotope ?

The average atomic mass of Copper is; 63.546 u

The relationship between abundance, mass of isotopes and average atomic mass is;

(M1)(x) + (M2)(1-x) = M(E)

Where;

M1 = Mass of first isotope

x = Abundance of first isotope

M2 = Mass of second isotope

M(E) = Average atomic mass

Inserting the vaues, we have;

62.9396 (x) + 64.9278 (1-x) = 63.546

62.9396x - 64.9278x + 64.9278 = 63.546

- 1.9882x = 63.546 - 64.9278

- 1.9882x  = - 1,3818

x = 0.695 or 69.5%

The percentage relative abundance of Cu-63 is 69.5% and that of Cu-65 is 30.5%

The mass of the amonia that can be produced in the reaction is 51 g of ammonia.

We know that a reaction equation has to do with the ay in which there is the combination of the reactants and the products in the reaction. We know also that it is possible to be able to obtain the parameters in the reaction by the use of the stoichiometry of the reaction.

We would have to write down the reaction equation so that we can be able to apply the principles of stoichiometry as we try to solve the problems that have t do with the reaction equation in the problem.

The reaction equation can be written as; \(N_{2} +3H_{2} ----- > 2NH_{3}\). In the reaction equation it is clear that;

3 moles of hydrogen produced 2 moles of ammonia

4.5 moles of hydrogen would produce 4.5 * 2/3

= 3 moles

Mass of the ammonia = 3 moles * 17 g/mol

= 51 g of ammonia

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Answer:

The nuclide formed by the β decay of 26Al is 26Mg.


Mark my answer as brainliest! this was a difficult one

The name for H2SO4(aq) is Sulfuric acid.

Sulfuric acid (H2SO4) is a highly corrosive and strong acid. It is one of the most important industrial chemicals produced worldwide. Sulfuric acid is commonly used in various industries for a wide range of applications. It is used in the production of fertilizers, detergents, dyes, pharmaceuticals, and various chemical processes.

Sulfuric acid is also utilized in laboratories for its acidic properties and as a dehydrating agent due to its strong affinity for water. It is a dense, oily liquid that is colorless when pure but can appear yellowish or brownish due to impurities. When handling sulfuric acid, caution must be exercised as it can cause severe burns and is harmful if ingested or inhaled.

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Option B is the correct answer.

A disaccharide is a molecule which is made of two units of monosaccharide which is linked together by a glycosidic bond.

Example: Sucrose, lactose

Disaccharides, also called double sugar, is any substance that is composed of two molecules of simple sugars (monosaccharides) linked to each other. Disaccharides are crystalline water-soluble compounds.

Hence, option B is the correct answer.

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